Download the STSW-LINK009 software on your computer.
In the Device Manager window of your computer, find the ST-Link Debug option under Other devices.
Right-click the ST-Link Debug option and select Update Driver Software.
Click Browse my computer for driver software.
Enter the file path of the driver software that you downloaded and click Next.
The Update Driver Software installation window appears. By default, the Don’t Install option is highlighted in the window.
To install the virtual COM port drivers, on the Device Manager screen, select Update Driver Software option.
In the driver software installation window by default, the Don’t Install option is highlighted in the window.
After successful installation, you will see the driver software name below the Port (COM & LPT) option of the Device Manager screen.